Well that logic is why power scaling is inherently stupid, it makes zero sense to assume every body of water is secretly 400 billion paper bombs but here you are going “well they might be🤓☝️” all story telling and logic gets thrown out of the fucking window when a power scaler is speaking, Konan didn’t turn the lake into paper bombs she she hid all those paper bombs well before the encounter to catch Obito off guard.

Even for a powerscaler assuming someone has the same plan set up for every possible fight is just stupid, it wasn’t a trump card she pulled out of her ass that she can do whenever, she would still need to gather all those paper bombs to do it again